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Simplifying -21 = 7(6x + 7) Reorder the terms: -21 = 7(7 + 6x) -21 = (7 * 7 + 6x * 7) -21 = (49 + 42x) Solving -21 = 49 + 42x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-42x' to each side of the equation. -21 + -42x = 49 + 42x + -42x Combine like terms: 42x + -42x = 0 -21 + -42x = 49 + 0 -21 + -42x = 49 Add '21' to each side of the equation. -21 + 21 + -42x = 49 + 21 Combine like terms: -21 + 21 = 0 0 + -42x = 49 + 21 -42x = 49 + 21 Combine like terms: 49 + 21 = 70 -42x = 70 Divide each side by '-42'. x = -1.666666667 Simplifying x = -1.666666667
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